import math
class HeightException(Exception):
    def __init__(self,value):
        self.value = value
    def __str__(self):
        return '异常信息：身高应处于0.3~2.5，输入的身高是： {}'\
            .format(self.value)
def computeBMI():
    height = tloat(input('请输入身高（m）：'))
if height < 0.3 or height > 2.5:
    raise HeightException(height)
weight = flioat(input('请输入体重（kg）:'))
BMI = weight / math.pow(height,2)
if BMI < 18.5:
    print('消瘦')
elif BMI < 24:
    print('正常')
elif BMI < 28:
    print('超重')
elif
    print('肥胖')
try:
    computeBMI()
except HeightException as e:
    print(e)
except ValueError:
    print('输入的数据异常，请输入浮点数或整数！')